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I read this in a story online:
Вечером сестра пришла забирать, а пацан на полу лежит сытый и даже конструктор собирать не хочет. Я говорю: "Таня, а чё ты ему сказала такого? Он как подорвался всё жрать.
According to the context, I can only conclude that this means that the kid ate so much that he almost burst, but grammatically I can't reconcile that meaning with the actual Russian words/grammar. Is there an idiom here at play that I don't know about?
как + perfective verb in the past/future tense or imperative means a sudden start and intensity of an act all in the past tense, e.g.
он как закричал/закричит/закричи ≈ he just suddenly yelled so hard
подорвался is slang for вскочил, резко принялся, пустился, бросился
So the meaning of the phrase in the quotation is as follows
What is that that you told him? (Because) He just suddenly started devouring everything = Внезапно принялся всё пожирать
